This is part of the main problem with Nominet, a prediction based on what? Nothing, that's the answer. The launch of .uk was not in response to any real need, the market wasn't calling for .uk. Hell, did Nominet even bother contacting all the existing registrants with simple emails to get a feel for their requirements? No! Funny how an email push might suddenly be a good thing now .uk is in the shop window!
The overwhelming majority of the .uk domains registered to date are highly likely protective moves simply BECAUSE .uk has been pushed into the market place, irrespective of the 5 year option. One thing is crystal clear, Nominet's coffers will certainly grow from this, and money is what the large registrars will get too.
I get tired of reading about how Nominet gets other things right, who gives a damn about that, it's their job to do so. The reality is they are in a monopoly position, making far too much money for a non-profit organisation, unaccountable in any real sense of the word, not subject to FOI requests, and are out of reach in any effective way when it comes to the power of the majority of its members.